ollama: add pydocstyle linting for ollama (#27686)

Description: add lint docstrings for ollama module
Issue: the issue https://github.com/langchain-ai/langchain/issues/23188
@baskaryan

test: ruff check passed.
<img width="311" alt="e94c68ffa93dd518297a95a93de5217"
src="https://github.com/user-attachments/assets/e96bf721-e0e3-44de-a50e-206603de398e">

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/partners/ollama/langchain_ollama/__init__.py

@@ -1,3 +1,9 @@
+"""This is the langchain_ollama package.
+
+It provides infrastructure for interacting with the Ollama service.
+"""
+
+
 from importlib import metadata
 
 from langchain_ollama.chat_models import ChatOllama

libs/partners/ollama/langchain_ollama/chat_models.py

@@ -90,7 +90,7 @@ def _lc_tool_call_to_openai_tool_call(tool_call: ToolCall) -> dict:
 
 
 class ChatOllama(BaseChatModel):
-    """Ollama chat model integration.
+    r"""Ollama chat model integration.
 
     .. dropdown:: Setup
         :open:

libs/partners/ollama/langchain_ollama/embeddings.py

@@ -1,3 +1,4 @@
+"""Ollama embeddings models."""
 from typing import (
     List,
     Optional,

libs/partners/ollama/pyproject.toml

@@ -24,7 +24,20 @@ ollama = ">=0.3.0,<1"
 langchain-core = "^0.3.0"
 
 [tool.ruff.lint]
-select = ["E", "F", "I", "T201"]
+select = [
+  "E",    # pycodestyle
+  "F",    # pyflakes
+  "I",    # isort
+  "T201", # print
+  "D",    # pydocstyle
+
+]
+
+[tool.ruff.lint.pydocstyle]
+convention = "google"
+
+[tool.ruff.lint.per-file-ignores]
+"tests/**" = ["D"]  # ignore docstring checks for tests
 
 [tool.coverage.run]
 omit = ["tests/*"]

libs/partners/ollama/scripts/check_imports.py

@@ -1,3 +1,4 @@
+"""load multiple Python files specified as command line arguments."""
 import sys
 import traceback
 from importlib.machinery import SourceFileLoader